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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74c33633802e21ff2398f8f58ddfed9e75d0ce600bfc52a017c66c2a61968988' 
  AND token = 'rN59ppMdqjRtzOp439LJwOZjgP9x3BgzP4tGumFddo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}